Insulator



W. VOGLER.

INSULATOR.

(No Model.)

No. 445,008. Patented Jam-20, 1891.

'mz mms revus en., mimo., immun, n. c.

UNITED STATES PATENT OFFICE.

WILLIAM VOGLER, OF SOMERVILLE, MASSACHUSETTS.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 445,008, dated January20, 1891.

Application filed May 2S, 1890. Serial No, 352,841. (No model.)

To all whom it may concern.-

Be it known that I, VILLIAM VOGLER, of Somerville, county ot Middlesex,State of Massachusetts, have invented an Improvement in Insulators, ofwhich the following description, in connection with the accompanyingdrawing7 is a speciication, like letters on the drawing representinglike parts.

This invention relates to insulators especially adapted to be used inthe overhead system ol:` electric railways as a support for the usualtrolley-wire.

In practice it has been demonstrated that many compositions Which areexcellent insulators in themselves are uniitted for use as an insulatorfor the overhead trolley-Wire, owing to the liability of the saidinsulating` material being melted by sparks or flashes of the currentbetween the trolley-Wheel and the trolley-Wire.

My invention has 'for its object to provide an insulator capable ofresisting the action of the electric flash or spark, whereby thecompositions heretofore untitted for service on electric railways may beused.

In accordance with my invention the insulator is composed of a centralportion ot' insulating material ot high insulative capacity and anoutside or protective covering of insulating material oi a lowerinsulative capacity, but of a higher refractory nature. The central bodyportion of the insulator in practice will preferably be molded around asleeve threaded on its inner side to engage the threaded shank ot' abolt or hanger to which the trolley-Wire is secured, and the outside orprotective coveringis molded upon the central insulating-body- Hyinvention therefore consists in the herein-described insulator, itconsisting ci an inner body of high insulating capacity and an outerbody ot high refractory nature protecting the inner body; substantiallyas will be described. f

The drawing is a longitudinal vertical section of one `form of insulatorembodying my invention, the said insulator having secured 'to it theusual trolleynireB My improved insulator consists ot' an inner orcentral body d, herein shown as cone-i5@ shaped, it being composed ofmaterial of a high insulating capacity. rIhe inner body a has moldedabout it an outer body a of a lower insulating capacity than the body a,but

of a more refractory nature, the said outer 55 body acompletelyenveloping the high-insulating body a, so that the latter iscompletely protected from sparks or flashes, which in practice mightarise by the breaking ofthe contact between the usual trolley-Wheel (not6o side of the insulator into a threaded sleeve 65 cr nut 122,) aboutwhich the insulating-body a is first molded.

The insulator in practice is suspended, as herein shown, by means ol' aWire c and branch Wires cj secured to the said Wire and 7o to a Wire ci,herein shown as located in a groove formed in the surface of the outerbody a near the base of the insulator; but I do not desire to limitmyself to the particular manner shown for suspending the insu- 7 5later7 as it may be suspended in any usualor Well-knoivn manner.

I have herein shown my improved insulater as cone-shaped5 but I do notdesire to limit myself in this respect, as the saidinsrn 8o lator may beof any desired form.

It will be noticed that the insulating inner body a, which is ol highinsulative capacity, is completely protected by the outer body a',

which is oi' a lower insulative capacity,but ot' S5 a higher refractorynature, so that it is un affected by the sparks or ilashcs.

The inner body c may be made ol any ot the high insulating compositionsnew known to electricians, and the outer body may be 9o made ofpulverized broken glass or asbestus cemented together by aWater-proofing material.

1. The herein-described insulator', it con- 95 sisting of an inner bodyof high insulating capacity and an outerbodyof high refractory .Intestimony whereof I have signed my` nature protecting the inner` body,substzm name to this specication in the presence 'of xo tially asdescribed. two subscribing Witnesses.

2. The herein-described insulator, it con- 5 sisting of an inner bodyot' high insulating WILLIAM VOGLER.

capacity and an outer body of high refractory Witnesses: natureenveloping the inner body, substan- JAS. H.' CHURCHILL, tially asdescribed. EMMA J. BENNETT.

